/*
 * Copyright University of Toronto 1988, 1989, 1994, 1996, 1997, 1998, 
 * 2000, 2004.
 * (except where indicated otherwise in source file) 
 * by John DiMarco and Mark Moraes
 *
 * Permission is granted to anyone to use this software for any purpose on
 * any computer system, and to alter it and redistribute it freely, subject
 * to the following restrictions:
 *
 * 1. The author(s) and the University of Toronto are not responsible 
 *    for the consequences of use of this software, no matter how awful, 
 *    even if they arise from flaws in it.
 *
 * 2. The origin of this software must not be misrepresented, either by
 *    explicit claim or by omission.  Since few users ever read sources,
 *    credits must appear in the documentation.
 *
 * 3. Altered versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.  Since few users
 *    ever read sources, credits must appear in the documentation.
 *
 * 4. This notice may not be removed or altered.
 */